package com.atguigu.strategy;

public abstract class Duck {
    public Duck() {
    }

    public abstract void display();

    public void quack() {
        System.out.println("鸭子嘎嘎叫---");
    }

    public void swim() {
        System.out.println("鸭子会游泳---");
    }

    public void fly() {
        System.out.println("鸭子会飞翔---");
    }
}
